椰枝纤维基木塑复合材料的动态机械分析.doc

椰枝纤维基木塑复合材料的动态机械分析 作者：王广静 朱赛玲 施礼纳 王琪 蔡砚琪 指导老师：徐长妍 摘 要：为了寻找椰树枝叶适用于木塑复合材料的最佳部位，分别对分段部位进行化学成分分析，并以不同部位椰叶纤维制备木塑 ( WPC) 复合材料，测定其弯曲性能、动态热机械性能，通过时温等效原理在实验基础上推测材料在更宽温度范围内的松弛转变曲线，结果表明，以整体未分段混合料制备的木塑复合材料的弯曲模量为 3463.95MPa，弯曲性能最好。在动态黏弹性测试过程中，在 25-150℃范围内，观察到一个α松弛过程，且 F-0( 整体混合料),F-1( 椰枝细端),F-2 ( 椰枝中段) ,F3( 椰枝粗端) 制备的木塑复合材料在α松弛过程中的活化能分别为516.481,617.216,693.546,557.851kJ/mol。在 75-145℃范围内，储存模量 E’满足时温等效原理(TTSP)。 关键词：化学成分; 动态热机械性能; 弯曲强度;储存模量 Dynamic Mechanical Properties of Coconut Palm Petiole Fiber/Wood Plastic Composites WANG Guang-jing,ZHU Sai-ling,SHI Li-na,WANG Qi,CAI Yan-qi Abstract:The objectives of this paper was to find the best part of coconut palm petiole to produce the coconut palm petiole fiber/HDPE composites，chemical composition analysis was carried out on the segmented parts respectively ,and prepared the wooden plastic composites(WPC)based on the segmented parts.Traditional mechanical test and dynamic mechanical properties were used to investigate the dynamic thermal mechanical behavior of the materials. And the TTSP(the time-temperature superposition principle) was used to determining the long-term creep behavior of composites at ambient temperature from experimental data obtained from short-term tests over a range of elevated temperature. The results showed that the overall not segmented materials were the best suitable for wood plastic composite as it had the best bending resistance，the bending modulus was 3 463. 95 MPa. In the process of dynamic viscoelasticity test , a relaxation process can be observed in the range of 25-150C，the activation energy in the a relaxation process of the not segmented petiole WPC(F-0)，thin end petiole WPC(F-1)，middle part WPC(F-2)，coarse side of the petiole WPC(F-3)were 516. 481 kJ /mol , 617. 216 kJ / mol , 693. 546 kJ / mol , 557. 851 kJ /mol, respectively. In the range of 75-145 C，storage modulus ( E’)meet the time-temperature superposition principle ( TTSP). Keyword